From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3E3DFC433DB for ; Wed, 30 Dec 2020 12:31:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0443722209 for ; Wed, 30 Dec 2020 12:31:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726662AbgL3MbL (ORCPT ); Wed, 30 Dec 2020 07:31:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35108 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726626AbgL3MbK (ORCPT ); Wed, 30 Dec 2020 07:31:10 -0500 Received: from mail-qk1-x735.google.com (mail-qk1-x735.google.com [IPv6:2607:f8b0:4864:20::735]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F5ECC06179B for ; Wed, 30 Dec 2020 04:30:30 -0800 (PST) Received: by mail-qk1-x735.google.com with SMTP id 19so13703430qkm.8 for ; Wed, 30 Dec 2020 04:30:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=YQcFI5pwFnCR/lxsJDtFdVGybJ7BlJDdpeZ+VPboYXA=; b=NwqQ5d7PzMXlE+JWzXrVpJuGwutrbgC8Sj9QXhPkNVyVdDGztI9Byr/M4HTu8GKHDY EHYnHAlu/8x7YMf/rRguMSNazy0Rwq7UJ5UsIS9DqLlNYS0atwcOlVIx7QPw2mxZTZMF sw41pJn5D9t7YVvAL6rUpzE2ytqLWas+38xxe937HRi/uegIPaujOwXcvPLVmcqip6t1 H0gEBKJlEblDRCOZiVwJabXqFlISc1iCWnD2YML5/Ua3WkGGrWlW/CcpyiWzpteeY2Hv l+/PfQLV+24DLZlj/KU3IfncK6xtjobv8AqkBLHOHowRZmhxJqKnHQlDkxymcgoICJxT rk9w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=YQcFI5pwFnCR/lxsJDtFdVGybJ7BlJDdpeZ+VPboYXA=; b=kWQ3GgmX5Q2FaXMUKwRJGULixxyXI3oyyLGqsJbIW0tdQhRQkkAMqpNYai0KqnBsqA cfz/v6GZdYrMRktu3dmBo6pK64WMcZkKUJ9+WxfGM7V8rYA9X8fH7a1MEAL10zxjoa6J ymyMxjwwFLEBpuAONrRTg64/3OIF1XSkWq0a4iR9yjNPOMmqa9wRgq5+UW1u1VKfdtPu LmtzQI301ZTPgW/r9AaSJNbMqpY0qPcOyGtHwraxg0JMQymomEQ+75voo22g0NIGzMs1 X871Cny408U6TBI+BqGYa9vv1dnnE3+nlYR0ESFChmhX8O74rZf2U5agwKculmK3hE7o lgzg== X-Gm-Message-State: AOAM530hT0zdbi0wjNSmjbUeRTxGz2eOuEblBfE6blpVH2LhHB8oVQBr bWA3sTHe90+1imgdOwxk+VI= X-Google-Smtp-Source: ABdhPJxsAQrfXiVGxK7g3vS/PmvvI+xQBVDpATeIUtumoaMOuQnH2ddh7cqRBSM9xQdOuu7HLG5NJw== X-Received: by 2002:a37:4889:: with SMTP id v131mr37613631qka.410.1609331429763; Wed, 30 Dec 2020 04:30:29 -0800 (PST) Received: from hoboy.vegasvil.org (c-76-110-219-245.hsd1.fl.comcast.net. [76.110.219.245]) by smtp.gmail.com with ESMTPSA id j29sm26688893qtv.11.2020.12.30.04.30.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Dec 2020 04:30:29 -0800 (PST) Date: Wed, 30 Dec 2020 04:30:26 -0800 From: Richard Cochran To: Willem de Bruijn Cc: Jakub Kicinski , virtualization@lists.linux-foundation.org, Network Development , "Michael S. Tsirkin" , Jason Wang Subject: Re: [PATCH rfc 2/3] virtio-net: support receive timestamp Message-ID: <20201230123026.GA2034@hoboy.vegasvil.org> References: <20201228162233.2032571-1-willemdebruijn.kernel@gmail.com> <20201228162233.2032571-3-willemdebruijn.kernel@gmail.com> <20201228145953.08673c8c@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Mon, Dec 28, 2020 at 07:57:20PM -0500, Willem de Bruijn wrote: > There is a well understood method for synchronizing guest and host > clock in KVM using ptp_kvm. For virtual environments without NIC > hardware offload, the when host timestamps in software, this suffices. > > Syncing host with NIC is assumed if the host advertises the feature > and implements using real hardware timestamps. Sounds reasonable. Thanks, Richard